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Expansion Audio Chips

Add-on hardware that gave individual games extra sound channels beyond what the base console could produce — from FM synthesis to wavetable oscillators.

NES / Famicom

FDS1 game

Famicom Disk System — 1 modulated wavetable channel (many FDS exclusives)

MMC50 games

Nintendo MMC5 — 2 pulse channels + 1 PCM channel (Castlevania III NA, Just Breed, Dai Koukai Jidai)

N1630 games

Namco 163 — up to 8 wavetable channels (Erika to Satoru no Yume Bouken, Megami Tensei II, King of Kings)

Sunsoft 5B0 games

Sunsoft 5B / AY-3-8910 compatible — 3 additional pulse channels (Gimmick!, Batman: Return of the Joker JP)

VRC60 games

Konami VRC6 — 2 pulse channels + 1 sawtooth (Akumajo Densetsu / Castlevania III JP, Esper Dream 2, Madara)

VRC70 games

Konami VRC7 — 6-channel FM synthesis (OPL2 subset) (Lagrange Point)